pest-parser/pest

Health v2 · maintenance only

Adoption not part of the score

5384 stars · 304 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

pest is a general-purpose parser library for Rust based on parsing expression grammars (PEG). Grammars are defined in separate .pest files, and the library generates parsers with automatic, meaningful error reporting.

Use cases

• parse a custom DSL in Rust
• write a PEG grammar for a config file format
• build a parser for a programming or markup language
• replace hand-written parsers with grammar-based ones
• get meaningful error messages when parsing fails
• parse structured text like identifiers, expressions, or logs

When to choose

• you are writing Rust and need a parser for a text format or language
• you want grammars kept separate from procedural code
• you need good error reporting out of the box
• you want correctness guarantees from a declarative grammar

When to avoid

• you need a hand-tuned parser faster than nom or serde-level performance
• you need context-sensitive parsing beyond PEG expressivity
• you are not working in Rust

Facets

library · maturity stable

parser parsers programming-languages developer-tools rust peg grammar parser-generator parser-combinators error-reporting

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